If the range is published as 17.4 - 21 r, this CV is outside of the ASAS-SN range (which only reaches mag. 17).

What you see are just sporadic detections of the 10.75 Vmag. star BD-7 5461 which is 33" to its NE.

Keep in mind that surveys don't have good resolution and nearby stars will be blended or be included in the photometry in nights of poor seeing.

[Update:
I had included a light curve from CRTS assuming no light contamination (since it shows variability with the published range of the CV) but this is a nearby red star 10" to the NW of the dwarf nova and the variation is indeed light contamination too. The 10.75 Vmag star is too bright.
See the SDSS image.]

So, don't expect to see outbursts at mag. 10-11. The star reaches mag. 17 at maximum.